Nucleating composition and thermoplastic polymer composition comprising such nucleating composition

1. A thermoplastic polymer composition, comprising

thermoplastic polymer,

an organic peroxide, and

a nucleating composition comprising:

(a) a first nucleating agent, which comprises a cyclic dicarboxylate salt compound; and

(b) a second nucleating agent, which comprises talc,

wherein the cyclic dicarboxylate salt compound has the formula (I):

wherein said thermoplastic polymer is a heterophasic propylene copolymer comprising a matrix phase comprising propylene and a dispersed phase comprising an ethylene-alpha-olefin elastomer, wherein the heterophasic propylene copolymer has a melt flow index of at least 1 dg/min.

2. The thermoplastic polymer composition according to claim 1 ,

wherein the heterophasic propylene copolymer comprises from 60 to 92 wt % of the matrix phase and from 8 to 40 wt % of the dispersed phase,

wherein the matrix phase comprises a propylene homopolymer and/or a propylene copolymer comprising at least 90 wt % of propylene and up to 10 wt % of ethylene and/or at least one C 4 to C 10 alpha-olefin, and

wherein the ethylene-alpha-olefin elastomer of the dispersed phase comprises from 40 to 65 wt % of ethylene and from 35 to 60 wt % of at least one C 3 to C 10 alpha-olefin.

3. The thermoplastic polymer composition according to claim 1 , wherein the heterophasic propylene copolymer has a melt flow index of less than 10 dg/min.

4. The thermoplastic polymer composition according to claim 3 , wherein the matrix phase has a melt flow index of at least 1 dg/min.

5. The thermoplastic polymer composition according to claim 3 , wherein the ethylene-alpha-olefin elastomer comprises from 40 to 60 wt % of ethylene and from 40 to 60 wt % of propylene.

6. The thermoplastic polymer composition according to claim 3 , wherein the thermoplastic polymer composition has a melt flow index of at least 5 and less than 30 dg/min.

7. The thermoplastic polymer composition according to claim 3 , wherein the thermoplastic polymer composition has a flexural modulus L of at least 1000 MPa.

8. The thermoplastic polymer composition according to claim 3 , wherein the thermoplastic polymer composition has an Izod impact strength L (23° C., kJ/m 2 ) of at least 55.

9. The thermoplastic polymer composition according to claim 3 ,

wherein the thermoplastic polymer composition has a melt flow index of at least 5 and less than 30 dg/min,

wherein the matrix phase has a melt flow index of at least 1 dg/min and less than 50 dg/min,

wherein the ethylene-alpha-olefin elastomer comprises from 40 to 60 wt % of ethylene and from 40 to 60 wt % of propylene,

wherein the thermoplastic polymer composition has a flexural modulus L of at least 1000 MPa, and

wherein the thermoplastic polymer composition has an Izod impact strength L (23° C., kJ/m 2 ) of at least 55.

10. The thermoplastic polymer composition according to claim 9 ,

wherein the thermoplastic polymer composition has a flexural modulus L of at least 1100 MPa,

wherein the thermoplastic polymer composition has an Izod impact strength L (23° C., kJ/m 2 ) of at least 60.

11. A shaped article comprising the thermoplastic polymer composition according to claim 9 .

12. The thermoplastic polymer composition according to claim 1 , wherein the heterophasic propylene copolymer has a melt flow index of at least 10 dg/min.

13. The thermoplastic polymer composition according to claim 12 , wherein the matrix phase has a melt flow index of at least 50 dg/min.

14. The thermoplastic polymer composition according to claim 13 , wherein the thermoplastic polymer composition has a melt flow index of at least 30 dg/min.

15. The thermoplastic polymer composition according to claim 12 , wherein the thermoplastic polymer composition has a flexural modulus L of at least 1400 MPa.

16. The thermoplastic polymer composition according to claim 12 , wherein the thermoplastic polymer composition has an Izod impact strength L (23° C., kJ/m 2 ) of at least 5.

17. A shaped article comprising the thermoplastic polymer composition according to claim 1 .

18. The thermoplastic polymer composition according to claim 1 ,

wherein the heterophasic propylene copolymer has a melt flow index of at least 10 dg/min,

wherein the matrix phase has a melt flow index of at least 50 dg/min,

wherein the thermoplastic polymer composition has a melt flow index of at least 30 dg/min,

wherein the thermoplastic polymer composition has a flexural modulus L of at least 1400 MPa, and

wherein the thermoplastic polymer composition has an Izod impact strength L (23° C., kJ/m 2 ) of at least 5.

19. The thermoplastic polymer composition according to claim 18 ,

wherein the thermoplastic polymer composition has a flexural modulus L of at least 1400 MPa, and

wherein the thermoplastic polymer composition has an Izod impact strength L (23° C., kJ/m 2 ) of at least 6.

20. A shaped article comprising the thermoplastic polymer composition according to claim 18 .